$MechUseMinimalRotation3D

• $MechUseMinimalRotation can be set to True to cause Modeler3D to use a minimal rotation formulation to transform axes that have no specified reference direction.

• The default setting of $MechUseMinimalRotation is False.• The minimal rotation formulation rotates the given axis through the minimal rotation required to be aligned with + Z.• The minimal rotation formulation produces a symbolic result that is much simpler, but becomes singular when the axis is pointed in the - Z direction.• The default formulation uses the Step function to generate a more complex piecewise continuous result that is nonsingular for any configuration.• Whether or not the symbolic axis transformation becomes singular is irrelevant if axes are specified entirely numerically, as they typically are.• See also: ReferenceDirection.